Thursday, July 18, 2013

Dodge SRT Viper, 2013

Dodge SRT Viper, 2013

The all-new 2013 SRT Viper was unveiled at the 2012 New York International Auto Show, marking its highly anticipated return to the high-performance sports car market.

The fifth generation of the iconic two-seat, American-built supercar has been deliberately evolved to incorporate superior craftsmanship, a host of new technologies and ergonomic improvements while respecting its visceral legacy of outright performance.

Two new models for any performance buyer
For the 2013 model year, two new models of the iconic supercar will be hand built at the Conner Avenue Assembly Plant in Detroit - the home for Viper since 1995. Both SRT Viper and SRT Viper GTS models offer new interior and exterior designs incorporating premium materials and new exterior surfaces with aerodynamically functional details that are beautifully integrated into the high-tech carbon fiber and aluminum skin. On the inside, designers and engineers strived to rethink all touch points; and upgrade all material appointments and technologies.

The SRT Viper GTS builds on the DNA of the SRT Viper model with more technologically advanced solutions, like two-mode active suspension, to allow this world-class GTS to find new limits on the track while also opening up its envelope as a more premium and mature evolution of the classic, extreme performance formula. Designed and built with premium features and materials inside and out, the Viper GTS will compete with the best performance vehicles in the world with a wide range of creature comforts, advanced drivetrain and interior technologies.

Awe-inspiring V-10 powertrain
At the heart and soul of the 2013 SRT Viper is the venerable, hand-assembled 8.4-liter all-aluminum, V-10 overhead-valve engine.

Improvements for 2013 include a new, ultra-high flow and lightweight composite intake manifold, high-strength forged pistons, sodium-filled exhaust valves, new catalysts to reduce back pressure and an aluminum flywheel that reduces reciprocating losses. More than 25 pounds has been shaved from the fully dressed engine.

Preliminary performance ratings for the SRT-engineered V-10 Viper are 640 horsepower and 600 lb.-ft. of torque - the most torque of any naturally aspirated engine in the world.

The Tremec TR6060 six-speed manual transmission has been improved with a shorter throw shifter, closer gear ratios and a final drive ratio that has been shortened to 3.55 from 3.07. The 2013 Viper models will be more engaging to drive and top speed is now achieved through 6th gear with maximum engine speed (redline) at 6,200 rpm.

Outstanding ride, handling and capability
Starting with a stiffer structure that provides 50 percent more torsional rigidity, the chassis of the 2013 SRT Viper benefits from numerous enhancements - many learned through racing efforts with Viper GTS-R and Competition Coupe models.

Major updates include the addition of a new aluminum "X" brace under the hood that ties the suspension pickup points to the magnesium cowl super casting and contributes to improved torsional rigidity and stiffness. A new aluminum impact beam at the front of the car contributes to overall mass savings and improved weight distribution while providing excellent crashworthiness.

Structurally, many areas of the chassis were reworked to take advantage of new materials, reduce thickness in some areas and reshape components for more structural rigidity in others. The result is an overall weight savings of approximately 100 pounds.

At the rear, the suspension has been re-engineered with the toe link moved forward of the axle for better tow control and dynamic stability.

Four-piston Brembo brakes with fixed-aluminum calipers, and vented rotors with a diameter of 355 mm by 32 mm, are used at all four corners. Brake calipers are forged and weight optimized by fully machining all surfaces. The calipers are among the stiffest available with distortion from heat nearly eliminated even under the most demanding braking conditions.
The available SRT Track Package features lightweight and slotted two-piece rotors from StopTech.

New premium materials, craftsmanship and technologies
The all-new, driver-oriented interior cabins of the SRT Viper models have been totally revamped for 2013 with superior craftsmanship, premium material appointments and performance-oriented technologies.

For the first time, all major interior surfaces are sewn and wrapped with additional padding applied in comfort areas. On the Viper GTS model, all surfaces are fully leather skinned, and standard accent colors are applied to the seats, doors, center console and stitching.

Standard high-performance racing seats from Sabelt feature a lightweight Kevlar/fiberglass shell created by a state-of-the-art resin transfer molding technology for mass reduction and long-term durability. Both driver and passenger enjoy improved comfort from thigh support and deep side bolsters designed to match the extreme lateral acceleration capabilities of the SRT Viper.

Seating position in the 2013 SRT Viper models is 20 mm lower for more room and enhanced performance-driving ergonomics. Seat travel is extended by 90 mm overall, which enables expanded seating options from a more rearward positioned bulkhead. For the first time, seat height can be adjusted by up to 40 mm - manually on the SRT model and power controlled on the GTS.

The new 2013 Viper is the most spacious model in the history of the nameplate. The floor pan and bulkhead have been extended approximately 90 mm to provide improved legroom and more rearward seat track movement.

Designed specifically for the 2013 SRT Viper, the new 7-inch, full-color, customizable instrument cluster display uses a full-time analog tachometer readout in the center to confirm the performance driving feedback philosophy of the Viper. Drivers have a wide range of custom and personal options such as an additional digital speedometer readout just below the tachometer. The vehicle information is clearly communicated with easy-to-understand icons. Intuitively controlled through a simple four-way steering-wheel control, the driver can configure the screens to display the information they desire, easily mixing and matching information.

Uconnect Access provides new level of connectivity

The 2013 SRT Viper lineup includes the new, next generation Uconnect Access in-vehicle connectivity system that provides drivers with access to more information, emergency services, more entertainment and improved graphics.

Viper customers can choose between two Uconnect Media Centers, RA3 and RA4, which provide a range of new features and multiple ways to control media in the vehicle. The system includes an 8.4-inch touchscreen along with a set of hard keys for commonly used functions, including traditional knobs for tuning the radio bands and radio volume. Touchscreen buttons along the bottom of the screen allow drivers to easily access the radio, climate controls, navigation, phone, and new, select, certified applications. The new, highly sculpted steering wheel has a host of finger-tip mounted controls for audio, Uconnect, cruise control (first application) and launch control.

SiriusXM Travel Link also is available with Uconnect, providing premium data services and information to make every trip more efficient. SiriusXM Traffic works with the vehicle's navigation system to display traffic speed and traffic flow information along with accident information to assist drivers in routing around congested areas. An expanded SiriusXM channel lineup includes exclusive programming, including the new SiriusXM Latino channels, an auto industry first.

A range of Harman Kardon surround-sound systems are available across the SRT Viper lineup that feature the latest in audio system technology. All Harman Kardon audio systems include a high-voltage class D amplifier with tracking power supply and up to 11 channels of amplification. The Harman Kardon system with exclusive Logic 7 surround-sound processing is available in the Viper GTS model with a total of 18-speakers, including four subwoofers located behind the seats. All Harman Kardon systems in the 2013 SRT Viper lineup include high-performance, high-efficiency GreenEdge technology loudspeakers that are extremely light and include rare earth magnets. The magnets inside each speaker ensure efficient speaker operation and enhanced performance. The audio systems operate on 32 volts - so the new and improved sound system achieves more than double the acoustic power of the current system.

The forward-hinged hood carries the redesigned Viper badge - aptly named "Stryker" by the Viper Club of America - positioned in the center; and offers unobtrusive access to several service points and the SRT-engineered V-10 powerplant.

The classical low-stance and the extreme cab rearward proportions that have become the unmistakable silhouette of the iconic supercar, return on the 2013 SRT Viper models along with the dramatic fender "gills" - another traditional Viper design cue that helps to extract heat from the engine compartment.

The 2013 Viper models feature a contemporary take on the traditional "double-bubble" roof configuration that maximizes headroom for the driver and passenger while maintaining a low frontal area - allowing additional room for helmets during recreational competitive driving.

The lower-front grille is purposefully designed as an evolution of the traditional Viper low-profile cooling opening configuration and discretely carries a refined V-shape structure.

The exhaust system continues to exit forward of the rear wheels and now carries further refinement with cast aluminum, sill-mounted exhaust bezels.

For the first time, the 2013 SRT Viper models carry LED taillamps that integrate stop-and-turn illumination in one element. Snakeskin texture in the lens carries the surface work seen in the gills and hood textures. With dark-masked lenses, the horizontal lamps appear dark until the LED elements fire. Each lamp carries 50 LEDs that provide a unified "crystallized" illumination effect.

For the first time, all major interior surfaces are sewn and wrapped with additional padding applied in comfort areas. On the Viper GTS model, all surfaces are fully leather skinned and standard accent colors are applied to the seats, doors, center console and stitching.

"Our passionate team of designers and SRT engineers set out to revamp the Viper interiors with truly premium materials, extreme attention to details and the newest information display technologies," said Klaus Busse, Head of Interior Design — Chrysler Group LLC. "The new cockpit carries a driver-oriented theme that rewards the senses with true supercar feel and looks."

New, standard racing seats were developed with Sabelt, the renowned supplier of race-oriented interior components. The high-performance seats feature a Kevlar cushion and lightweight fiberglass shell created by a state-of-the-art resin transfer molding technology for mass reduction and long-term durability. Both driver and passenger enjoy improved thigh support and deep side bolsters designed to match the extreme lateral acceleration capabilities of the SRT Viper while providing comfort. Both seats can also accommodate a 3- or 6-point harness for racing belts.

Seating position in the 2013 SRT Viper models is 20 millimeters (mm) lower for more room and enhanced performance-driving ergonomics. Seat travel is extended by 90 mm overall which enables expanded seating options from a more rearward positioned bulkhead. For the first time, seat height can be adjusted by up to 40 mm.

Premium woven-fabric seat skins on Viper (leather skinned on GTS) keep both driver and passenger comfortable, and both feature "Viper" embossed in the seat backs.

A new, fully leather-wrapped, three-spoke steering wheel is designed specifically for the 2013 SRT Viper models and features a thick performance-rim grip, flat-bottom contour for enhanced clearance, along with the new "Stryker" emblem in three-dimensional finish.

Performance-optimized weight ballasts located inside the new steering wheel provide the driver with precision feedback and a competition feel.

Audio system controls are located intuitively on the backside of the center spokes of the steering wheel. On the left front side of the steering wheel are controls to cycle through the instrument cluster menus, activate the voice-recognition system and place or receive handsfree phone calls. Electronic stability control four-mode selection, cruise and launch controls are located on the right side.

For the first time, cruise control comes standard on both 2013 Viper models - following a request from Viper Nation.

The new 2013 Viper is the most spacious model in the history of the nameplate.

The floor pan has been extended approximately 90 mm by moving the rear bulkhead rearward to provide enhanced legroom and more rearward seat track movement.

Storage space inside the new cockpit of the 2013 SRT Viper also has been improved with an oversized, lighted glove box that opens via a dampened door with an electric push button located in the center stack. A new storage compartment between the driver and passenger seat (open bin with netting on Viper model while enclosed, leather wrapped and sewn on GTS model) is integrated into the rear bulkhead.

Below the bulkhead storage area is a large, rubber-lined bin that features two full-size, removable cup holders (available on Viper, standard on GTS). Integrated map pockets are built into both doors on both models.

All interior storage spaces are flocked with soft-touch material, showing attention to the smallest design detail and to enhance overall quality.

Intricate interior detail appointments on the doors and center-storage tray include exclusive, subtle-raised schematics of famous race tracks including the 12.9-mile Nürburgring Nordscheilfe in Nürburg Germany and Laguna Seca Raceway in Salinas, Calif., where current single-lap records are held by previous generation Viper ACR models.

The performance trim layout of the 2013 SRT Viper model features a sewn-and-wrapped instrument panel, center console, doors and A pillars. Color-keyed stitching is applied throughout the interior cabin.

A variety of selectable colors are provocatively applied to the leather-appointed areas where the body comes in contact, including the doors, seats, console and HVAC outlet accents. Standard quality stitching is used in matching interior colors on the GTS model.

Available interior color combinations on the Viper GTS model include black, black/Header Red and black/Caramel.

An optional GTS Premium Interior Package features SRT Laguna premium leather surfacing throughout the entire cabin in either black or Sepia. Unique embossments are designed into the door bolsters, seats and the storage bag while a new Alcantara headliner completes the package.

New customizable instrument cluster configures to driver preference
Designed specifically for the 2013 SRT Viper, the new 7-inch, full-color, customizable display uses a full-time analog tachometer readout in the center to confirm the performance driving feedback philosophy of the Viper. Drivers have a wide range of custom and personal options, such as a digital speedometer readout just below the tachometer. A wide range of vehicle information is clearly communicated with easy-to-understand icons. Intuitively controlled through a simple four-way steering-wheel control, the driver can configure the screens to display the information they desire, easily mixing and matching information.

The customizable instrument cluster appears dark until the driver starts the car. Once the SRT Viper's V-10 engine fires up, the LED-backlit gauges come to life. The dominant center tachometer display features an animated readout that glows red and shows off the new "Stryker" logo when engine rpm approaches redline to safely alert the driver to upshift via their peripheral vision.

When necessary, additional context-based messages including warning and diagnostic information are displayed with easy-to-understand readouts. Text warning messages also are displayed and automatically sent into stored messages that enable the driver to review when parked.

Drivers can configure the tachometer to display their last shift point and a peak rpm hold marker can be set up for optimum performance.

The new customizable instrument cluster provides an unmatched presentation of the exclusive SRT Performance Pages' statistics and feedback to the driver, including 0-to-60 mph; 0-to-100 mph; eighth- and quarter-mile elapsed times; braking distance; instant G-force measurement readouts and top-speed performance. All Performance Pages data can be stored for future use.

Drivers can customize the cluster readouts through nine available main menus. The four corners of the center display can be set to show information at a glance, including current fuel economy, outside temperature, compass direction and alternate gauges when needed. The nine main screens include a full tachometer for the traditional performance enthusiast, speed, fuel economy, trip A odometer, trip B odometer, audio, stored messages, vehicle information and SRT Performance Pages.

The screens can be configured depending on driver preference. Once a screen is chosen, it becomes the default setting, with no need to select a save or set buttons. The settings are linked to each key fob, so two drivers who share a vehicle will see their personal gauge settings as soon as their key fob is used to start the vehicle.

Pumping up the volume more efficiently
The 2013 SRT Viper features a standard 9-speaker audio system that includes a 7-channel digital signal processer amplifier. Optional systems include the 12-speaker Harman Kardon surround system with 5.2 speaker playback architecture that features five surround channels and two subwoofers. An available 18-speaker Harman Kardon surround system with Logic7™ and 5.4 speaker playback includes five surround channels and four subwoofers. All Harman Kardon audio systems include a high-voltage class D amplifier with tracking power supply and up to 11 channels of amplification. The Harman Kardon systems also include high performance, high efficiency GreenEdge™ loudspeakers.

SRT Viper GTS models feature a standard 12-speaker Harman Kardon surround sound system with 5.2 speaker playback that includes five surround channels and two subwoofers. Available is an 18-speaker Harman Kardon surround-sound system with Logic7 with 5.4 speaker playback architecture featuring five surround channels and four subwoofers. Also included is the Harman Kardon high voltage class D amplifier with tracking power supply and up to 11 channels of amplification and high performance, high efficiency GreenEdge loudspeakers.

The GreenEdge loudspeakers are extremely light and include rare earth magnets. The magnets inside each speaker ensure efficient speaker operation and enhanced performance. The audio system also operate on 32 volts - so the new and improved sound system achieves more than double the acoustic power of the current system. The tracking power supply is the backbone to the audio system and provides power on demand. The system is designed to dynamically adjust to provide power when the music playing inside the vehicle needs it.

Uconnect Access arrives
Uconnect Access, Chrysler Group LLC's next generation, more powerful, in-vehicle connectivity system will be available with the introduction of the 2013 SRT Viper.

Customers will be able to choose between two new, next-generation 8.4-inch touchscreen Media Centers that will provide multiple ways to connect. The Uconnect Media Center R3 and Uconnect Media Center R4 include a wide range of features that will not only keep Viper customers connected, but more importantly keep them focused on the road.

With an under-the-hood cellular connection, occupants are connected to a variety of new services and select applications. The new Uconnect Access system also includes a new rearview mirror design that directly connects vehicle occupants to emergency services or roadside assistance at the touch of a button. The connection to emergency services is activated once the rearview mirror- mounted button is pushed.

Consumers also will be able to download Chrysler Group-approved applications that will be introduced over time. After downloading, SRT Viper customers can interact with approved applications that have been designed for in-vehicle use.

The next generation Uconnect system is designed to be forward-thinking, providing the freedom to upgrade to the latest features and services.

Certified applications are easily controlled and operated using steering-wheel controls, voice-recognition technology or via the single touch of a button.

The new Uconnect Access Media Center R4 provides consumers with HD radio, which offers new programming options and crystal clear sound. A wide variety of options for integrating digital music into the car, including USB, SD Card, auxiliary jack or CD are available.

Enhanced navigation features are available on the Uconnect Media Center R4 and include the ability to enter destination information and points of interest using voice recognition. Enhanced 3D graphics will help drivers identify buildings and landmarks along their route.

Sprint is the strategic wireless partner for the next-generation Uconnect Access system. The integrated wireless technology inside the 2013 SRT Viper enhances the driving experience by offering new connected services and select applications. The services delivered through the partnership are simple to use and offer an intuitive user experience.

An increasing number of features in the new SRT Viper rely on enhanced user interfaces, including voice-recognition capabilities and commands to keep the focus on the primary driving task.

Exterior Design
The all-new exterior designs of the 2013 SRT Viper and SRT Viper GTS models seamlessly blend contemporary execution with evolutionary refinements that incorporate new surfacing, world-class materials and technologies all geared to create a stunning example of a true driver's car.

Both new SRT Viper models continue to carry the timeless proportions of the three previous body styles of the iconic, two-seat, world-class supercar. From there the 2013 SRT Viper models sport refined visual and functional statements.

The redesigned Viper badge - aptly named "Stryker" by the Viper Club of America - is positioned in the center of a new, clamshell, all carbon-fiber hood. The forward-hinged hood, selected to satisfy Viper purists, offers significant weight savings and unobtrusive access to front suspension areas and the front, mid-engine, SRT-engineered V-10 powerplant.

A newly designed, significantly larger and dedicated "cold-air" intake - a visual styling cue from the first Viper coupe built in 1996 - is integrated into the hood of both Viper models. The 9-inch (229 mm) by 2-inch (51 mm) scoop vacuums cooler air that flows directly into the engine and doesn't mix with air taken in for the radiator. As a result, the incoming air is only 10 degrees above ambient temperature on average, producing consistent power output.

Three air extractors are strategically positioned on both sides of the centerline of the power-bulge hood on the Viper model to ensure effective removal of heat and reduced air turbulence in the engine compartment.

The Viper GTS features dual extractors to give the hood a more refined and organic look. Both hood designs were refined in the Chrysler Group's full-scale wind tunnel in Auburn Hills, Mich. for maximum thermal and aerodynamic performance.

Functional "blisters" incorporated into the headlamp lenses create a three-dimensional view that gives Viper a distinctive glare, while visually reducing the front overhang appearance. The 70-mm projectors are surrounded with silver rings - the only "bright element" in the vehicle's face - and are set against matte-black (Viper) or Dark Neutral Metallic Graphite (Viper GTS) bezels.

The lower front grille, purposefully designed as an evolution of the traditional Viper "bottom mouth" configuration, discretely carries a refined V-shape structure.

Finished front-brake cooling ducts in body color (Viper) or high-gloss black (Viper GTS) are efficiently placed within the lower grille and provide a refined surface contrast to the rest of the lower intake's organic surface work. The ducts effectively channel air to the front rotors and Brembo calipers to help cool the brakes and contribute to the Viper's legendary performance.

Beautifully sculpted and functional air inlets are positioned at the lower outboard corners of the front fascia to efficiently channel incoming air to, through and out the front wheel wells to reduce lift and increase high-speed stability.

The side profiles of the 2013 SRT Viper models showcase the low-stance, classical long-hood and cab-forward proportions that have become the unmistakable silhouette of the iconic supercar.

The dramatic fender "gills" - another iconic and traditional Viper design cue that functionally removes air and heat from the engine compartment - carry the same mold-in-color black serpentine textures as applied on the grille extractors.

The 2013 Viper models feature the traditional "double-bubble" roof configuration that maximizes headroom for the driver and passenger while maintaining a low frontal area - even when helmets are needed during competitive driving.

The stretched roofline - constructed in carbon fiber for the first time - enables the performance coupe to appear like it's sitting more atop its rear wheel line.

The extended roof "widow's peak" also brings a distinctive clean, swept appearance as it flows into the back glass surface.

Rear brake ducts (gloss black or available carbon fiber), integrated into the B-pillars, channel air downward to cool rear rotors and calipers while also helping to visually stretch the roof, window graphic and side view profile.

The rear back glass is flatter, inset and carries a seal free exposed edge of glass - again the result of an extended canopy and overall refined exterior execution.

For the first time, the 2013 SRT Viper models carry LED taillamps that integrate stop and turn illumination in one element. Snakeskin texture in the lens carries the surface work seen in the gills and hood textures. With dark-masked lenses, the horizontal lamps appear dark until the LED elements fire. Each lamp carries 50 LEDs that provide a unified "crystallized" illumination effect.

A new rear appliqué - painted in body color on the Viper model and gloss black finish (or available carbon fiber) on the Viper GTS - accentuates the rear width proportions and adds another level of detail.

Rear exhauster ports positioned beneath the taillamps extract air from beneath the car and out the rear wheelhouse to relieve pressure buildup for improved aerodynamics and enhanced stability.

The rear diffuser was designed in the wind tunnel for enhanced aerodynamic performance, optimum rear downforce and drag.

Wheel sizes are 18 inches by 10.5 inches in the front (0.5 inches wider than previous generation); and 19 inches by 13 inches in the rear.

For 2013, SRT Viper models ride on standard Pirelli P Zero, Z-rated tires with substantially improved performance. The Pirelli tire offerings - P295/30ZR18 on the front and P355/30ZR19 on the rear - feature silica and carbon-black enhanced tread compound molded into a subtle asymmetric, wide rib tread design to increase the rigidity of the tread to resist deformation, enhance grip and steering response on a variety of road surfaces, while also broadening the performance envelope.

Both the Viper and GTS models feature their own unique optional stripe pattern in three available colors including Black, Bright White and Gunmetal Pearl.

New 2013 SRT Viper V-10 Engine Offers More Power, More Torque, Less Weight

At the heart and soul of the 2013 SRT Viper is a hand-assembled 8.4-liter all-aluminum, V-10 engine.

The iconic V-10 has been continuously upgraded over the years with improvements in oiling, airflow and an industry-first, single-cam variable-valve timing system. For 2013, the engine features a new ultra-high-flow, composite intake manifold for improved air distribution, new forged pistons, new lightweight, sodium-cooled exhaust valves and an aluminum flywheel. The engine also includes new exhaust catalysts to reduce backpressure. The result is a significant improvement of 40 lb.-ft. of torque and 40 horsepower with weight savings of more than 25 pounds for the fully dressed engine.

Coupled to the more powerful engine is a Tremec TR6060 six-speed transmission that has been refined with tighter gear ratios and a shifter with reduced throws to maximize driver involvement, while effectively transferring power to the pavement. Additionally, the final -drive ratio has been shortened to 3.55 from 3.07 giving the 2013 SRT Viper even more voracious and effortless acceleration at all speeds.

For 2013, all Viper models will feature traction control. To help maximize traction for straight-line performance, all Viper models also will include launch control as standard equipment.

Also making its debut on Viper is an advanced multi-mode electronic stability control system. This feature will dramatically broaden the Viper's performance envelope for drivers at all skill levels.

Preliminary performance ratings for the SRT-engineered V-10 include horsepower increased to 640 and torque increased to 600 lb.-ft., making it the highest torque of any naturally aspirated automotive engine in the world. Maximum engine speed (redline) is 6,200 rpm with fuel cutoff at 6,400 rpm.

More power, an emphasis on even torque delivery throughout the operating range and attention to detail at all levels, combine to make the latest generation of the SRT Viper V-10 an outstanding successor to the Viper's lineage.

Block and reciprocating assembly
Constructed of precision cast aluminum, the 90-degree, deep skirt block includes use of high-strength T356 aluminum and includes cast-iron bore liners, strengthened bulkheads that ensure block rigidity under high rpm operating condition and improved water jackets for consistent temperatures across the engine.

Bore and stroke of the cylinders is 103 mm by 100.6 mm (respectively).

The forged-steel crankshaft is supported by six main journals with cross-bolted, four-bolt, main-bearing caps, two vertical and two horizontal, for increased structural strength. Forged, powder -metal connecting rods measuring 158.6 mm are included for superior strength.

The new V-10 includes the use of forged-aluminum pistons. In addition to higher strength, the new pistons are 10 grams lighter than the previous design to help reduce mass in the reciprocating assembly. Reduced diameter, full-floating, 24 mm piston pins also are new.

In addition to forging, the pistons have been developed for reduced friction. New steel piston rings also reduce friction with a 1.5 mm top and a 1.2 mm second ring width.

Compression ratio of the engine is 10.2:1.

One of the biggest contributors to the reduced rotating inertia in the powertrain is the aluminum flywheel. The new aluminum flywheel has reduced weight by 11 pounds. The flywheel includes a steel outer-ring gear and friction wear surface for durability. The flywheel, when combined with a twin plate 240 mm twin-disc clutch, reduces overall rotating inertia by 20 percent, translating in roughly 1/10th of a second reduction in 0-to-60 acceleration and improved performance in lap times on a typical road course by approximately .5 seconds.

For improved cooling, particularly at the rear cylinders, the head gaskets have been redesigned through the use of computer simulations, validation and extensive testing to provide more balanced cooling across all cylinders.

Oiling system
The 8.4-liter V-10 is fitted with a cast-aluminum oil pan that is designed to provide superior oil management characteristics in the most demanding driving situations. The design of the pan is fitted with special baffles, channels and scrapers to funnel engine oil back into the sump of the engine. Additionally, the pan is designed and constructed to serve as a structural component for improved powertrain bending.

The Viper V-10 also includes a unique, race-proven swinging arm oil pickup that moves with relationship to G-forces encountered in tight-track turning conditions, acceleration and braking conditions.

Exclusive to the Viper, the swinging pickup moves within the oil pan to ensure that the maximum amount of oil is available to the engine without any losses due to side-to-side sloshing in the pan.

A single gerotor oil pump provides the pressure for the oiling system and is directly driven off the crankshaft. The engine oil cooler is standard.

Oil change intervals are recommended at 6,000 miles. Pennzoil 0W40 synthetic motor oil is the exclusive lubricant recommended by SRT engineers for its ultra-low friction properties that contribute to the V-10's higher performance. Crankcase capacity with filter change is 10.5 quarts. A special SRT-designed oil filter is used with the 8.4-liter engine.

Intake assembly and cylinder heads
The intake assembly of the 8.4-liter Viper V-10 is entirely new with the adaptation of a new, lightweight composite intake manifold that provides better fuel/air distribution, excellent thermal capabilities and reduced weight.

The new intake system features runners that are approximately one-inch longer than the previous design, and the move to a composite construction from aluminum has reduced air charge temperatures significantly.

Like the block, cylinder heads are constructed of high-strength, T356 aluminum for superior strength. The combustion chambers have been computer numerical control (CNC) machined for improved flow and charge motion. Structural changes in the cylinder heads have been incorporated for strength and durability.

Combustion chambers are 72 cc in volume. Intake and exhaust valves are both angled at 12 degrees. Lightweight, hollow-stem, intake valves measuring 52.8 mm provide ample intake charging. Sodium-filled exhaust valves, measuring 40.8 mm, are now used. The use of lightweight valves helps reduce reciprocating mass from the valve train. Sodium is added to the exhaust valve stem for better heat transfer and helps prevent hot spots in the valve head and combustion chamber that can lead to engine knock.

Valves are actuated by a single assembled camshaft in the block. The Viper engine uses a unique roller-type cam-in-cam design that enables independent exhaust phasing relative to the intake.

The intake profile has been revised to provide more usable torque at the higher rpm ranges of the engine.

The V-10 is equipped with variable-valve timing (VVT) on the exhaust side.

Ignition is through 10 individual coil packs mated to dual-platinum spark plugs. Spark plugs have been designed for a 100,000-mile change interval.

Exhaust
Stainless steel tube-in-shell exhaust headers have been designed to provide very low restriction and a minimal amount of backpressure. Revised tuning of the exhaust provides a more distinct character at part throttle and authoritative tone at a higher rpm with noticeably quieter sound at a mid-range rpm.

For 2013, a revised catalyst wash coat system helps to reduce backpressure by nearly 20 percent.

Tremec TR6060 six-speed transmission
The proven Tremec TR6060 six-speed manual transmission features an entirely new gear set for 2013 to provide the optimal transfer of power from the engine to the rear wheels. The new close-ratio gearing provides a smaller drop in between gear shifts, smoother gear synchronization and overall shift feel.

The new gear set also takes full advantage with a more useful sixth gear that is designed for more power at the higher rpm ranges of the engine.

Drivers will feel a notable improvement in shifting quality with shift throws that are nearly 12.5 percent shorter due to a revised shifter-to-transmission connection. The leather-wrapped shifter assembly is connected directly into the transmission to eliminate complicated levers and pivots that interfere with communication with the driver. The result is a direct-mount shift system that provides a solid and precise shift feel.

The SRT Viper will be equipped with a final-drive ratio of 3.55 to complement the tighter ratios that improve acceleration and responsiveness.

Powertrain mounting
New for 2013, the Viper will include a new powertrain mounting system that uses two hydromounts for the engine.

Designed with a highly elasticized rubber, and filled with a hydraulic fluid, the hydromounts offer superior damping characteristics for grip, drive comfort and acoustic performance. Additionally, the hydromounts contribute to overall smoothness of the engine, particularly at idle.

Two hydromounts are used on the engine to help control vibration.

Like many other details on the 2013 SRT Viper, the motor mounts contribute greatly to the Viper's new-found manners and are another example of how SRT engineers managed to hone the character and broaden the appeal of the sports car without sacrificing its attitude.

Competition Proven and Track Tuned
Starting with a stiffer structure that provides 50 percent more torsional rigidity, the chassis of the new 2013 SRT Viper benefits from a host of engineering refinements designed to enhance both street touring and on-track performance.

True to its racing heritage, the newest Viper is track ready for expert drivers and has deep reserves of capability for a professional racer to indulge. Nearly every chassis system including structure, brakes, suspension, steering, wheels and tires have been re-engineered, redesigned and refined to increase overall performance and shed weight while keeping a near perfect 50/50 weight distribution for the 2013 Viper.

Dimensionally, the wheelbase is 98.8 inches (2,509 millimeters) while overall length is 175.7 inches (4,463 mm). Width of the 2013 SRT Viper is 76.4 inches (1,941 mm). For 2013, the Viper has shed more than 100 pounds with numerous chassis refinements including an all-new spaceframe that benefits from the latest in high-strength steels, carbon fiber and aluminum body panels, lighter wheels and reductions in overall engine weight.

Structure
Combining the best attributes of high-strength steel, magnesium, aluminum and carbon fiber, the structure of the SRT Viper benefits from many lessons learned at the track. Included is a 100 percent boxed frame for enhanced strength and stiffness. Lightweight and easy to repair, the frame has been re-engineered and has become a far better platform that greatly improves performance to achieve status as a world-class sports car.

Advanced high-strength, structural-steel members are used strategically throughout the new
re-engineered frame of the 2013 SRT Viper. To help reduce overall weight, areas of the frame have been refined to take advantage of new materials to reduce thickness in some areas, reshape components for structural rigidity in others and the extensive use of alloys including aluminum, magnesium and composites provide the necessary strength throughout the entire chassis with particular attention to the mounting points for the lightweight front-and rear-suspension systems.

While much of the technology applied to the spaceframe construction is hidden under the carbon fiber and aluminum body panels, a new addition to the structure is visible by simply lifting the hood.

Using lessons learned from the racetrack, a new structural X-brace ties the four corners of the engine compartment together and contributes to the 50-percent increase in torsional rigidity and stiffness. Borrowed directly from Viper GTS-R and Competition Coupe race models, the aluminum brace helps bring more enhanced steering response and uniform stiffness across the entire vehicle.

A new aluminum impact beam at the front of the 2013 SRT Viper also contributes to overall mass savings and improved weight distribution, while providing excellent crashworthiness characteristics.

To provide the near optimal weight distribution, the Viper continues with its front mid-engine layout that has the engine set back fully behind the centerline of the front wheels. The engine also is offset slightly to the right, which contributes to more area in the driver foot well for ideal placement of the throttle, brake and clutch pedals. More importantly, the offset helps cross-car weight distribution with the driver, increasing track performance.

Another example of combining advanced engineering with lightweight materials and thousands of hours of track testing is found in the front cross section. Exceptional front cowl strength is achieved with a cast-magnesium and machined front-dash structure that stretches across the full width of the vehicle.

Throughout the vehicle, structural integrity is greatly improved with a particular focus on suspension pickup points that allowed SRT dynamic engineers to better tune the damper. Improvements in strength were achieved while reducing mass of the Viper, on average, by more than 100 pounds. Taking advantage of the latest advancements in materials engineering, Viper body engineers were able to achieve the provocative body shapes and effectively reduce mass with the use of lightweight materials including composites and super-formed aluminum. The roof, hood and hatch are constructed of high strength carbon fiber while the entire door structure and panels are lightweight aluminum.

Front and rear suspension
With a front track widened from 61.7 inches to 62.4 inches for 2013, the fully independent front suspension features cast-aluminum unequal-length upper and lower A arms that help reduce unsprung mass and enhance handling and dynamic wheel control. For 2013, the suspension has been thoroughly retuned with new Bilstein aluminum-body shocks, spring rates and hollow front- and rear-stabilizer bars.

On Viper GTS models, gas-charged, monotube Bilstein Damptronic Select, aluminum- bodied shock absorbers equipped with large 46 mm pistons are new for 2013. The new two-mode shocks feature both street and track settings. Shock damping is driver selectable through a two-position switch located on the console within easy reach for the driver. Valving in track mode is optimized for track use to extract maximum grip from the tires.

In street mode, the shocks are designed to provide a compliant ride on the various types of pavement and road conditions, while still providing damping levels appropriate for the extreme capabilities of the SRT Viper GTS.

Spring rates on the Viper model's passive-shock package have decreased 5 percent, while spring rates on the Viper GTS model's Damptronic package have increased 5 percent for a 10 percent difference between the two packages.

Both front- and rear-stabilizer bars are hollow for weight savings and are 27 mm in diameter. The rear suspension has been re-engineered with the relocation of the rear-suspension toe-link. The toe link has been relocated from behind the rear-axle centerline to in front of the rear axle. Additionally, the inner pivot of the link uses a tuned bushing to manage rear-toe compliance with respect to lateral load.

Four-piston Brembo brakes with fixed-aluminum calipers are used up front and at the rear. Vented rotors with a diameter of 355 mm by 32 mm are used at all four corners. Pistons are 44 mm/40 mm, opposed, and brake calipers are forged and weight optimized by fully machining all surfaces. The calipers are among the stiffest available with distortion from heat nearly eliminated even under the most demanding braking conditions.

Total swept area of the brake system is 603 square inches spread over all four corners.

The SRT Viper also features a new master cylinder and power-brake booster for 2013. The brake system moves from a front-rear split to diagonal-split hydraulics.

Traction control and electronic stability control
For the first time the SRT Viper models will include both electronic stability control (ESC) and traction control systems.

The Viper GTS model features a four-mode ESC system includes speed sensors located at each wheel along with a yaw sensor, lateral G and steering-wheel angle sensor. The system is tuned to be fully track capable in all modes, including "Full On." Two graduated levels of stability and traction control are available in addition to "Full Off." This allows the driver to progressively reduce the amount of assist, as driver experience, skills and confidence are gained.

With the system in Full On, drivers receive the maximum benefits of both the traction control system and stability control without unnecessary intrusion and the full cornering capability of the vehicle is realized. Sport mode allows more longitudinal and lateral slip before the traction control and stability control system are engaged.

For competition, the Track mode has no traction control while the higher limits of Sport Mode stability control are maintained. In Full Off mode, both the traction control and stability control are disabled with the anti-lock braking system (ABS) remaining active. A steering-wheel mounted button enables the driver to select the optimal mode depending on road conditions or preference. A telltale graphic in the instrument cluster advises the driver which setting is activated in the ESC system.

Launch control
To help maximize straight-line performance in track conditions, all SRT Viper models will include launch control as standard equipment.

Operational in any ESC mode, the system is engaged by a button on the steering wheel. When the vehicle is at a complete stop, the driver engages the system and then quickly applies full throttle. Launch control holds the engine at optimal launch rpm and waits for the driver to release the clutch. Launch control then uses engine throttle only to achieve controlled wheelslip for maximum acceleration through first gear.

Wheels and tires
Wheel sizes and tire footprint are increased for the 2013 SRT Viper.

Wheel sizes are 18 inches by 10.5 inches up front and 19 inches by 13 inches in the rear. The new wheels also provide a substantial weight savings of more than 16 pounds and help reduce unsprung mass for better performance.

The Viper GTS has a split six-spoke forged-aluminum 'Venom" wheel design with three available finishes including polished face with graphite-painted pockets (standard), fully painted hyper-black or fully painted low-gloss black.

Specially formulated, Pirelli P-Zero, Z-rated performance compound tires are new for the SRT Viper. Up front, tires measure P295/30ZR18 and rear tires are P355/30ZR19. Final tuning of the new tires has demonstrated improved lap times and higher skidpad grip with the new tires. The new tires provide improved cool and wet weather performance and are tuned to give the driver better road feel.

Steering
Demanding drivers will notice dramatically improved and communicative steering feel with a new steering gear for the hydraulic rack-and-pinion system. The system offers increased on-center precision, as well as refined effort gradient as cornering loads increase. Steering ratio is 16.7:1 with 2.4 turns required lock-to-lock.

Combined with a foundation that starts with a new, stiffer frame that provides 50 percent more torsional rigidity, new shock absorbers, sway bars, Pirelli tires, steering gear and stability control, the 2013 Viper delivers precise road manners and exceptional track performance. The all-new 2013 SRT Viper inspires more involvement and new levels of confidence behind the wheel for non-professional drivers, while increasing Viper's extreme capabilities for owners who take their car to the racetrack.

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